20704089138869 has 2 divisors, whose sum is σ = 20704089138870. Its totient is φ = 20704089138868.

The previous prime is 20704089138773. The next prime is 20704089138907. The reversal of 20704089138869 is 96883198040702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16071960730225 + 4632128408644 = 4008985^2 + 2152238^2 .

It is a cyclic number.

It is not a de Polignac number, because 20704089138869 - 2²⁰ = 20704088090293 is a prime.

It is a super-2 number, since 2×20704089138869² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20704080138869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352044569434 + 10352044569435.

It is an arithmetic number, because the mean of its divisors is an integer number (10352044569435).

Almost surely, 2^{20704089138869} is an apocalyptic number.

It is an amenable number.

20704089138869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20704089138869 is an equidigital number, since it uses as much as digits as its factorization.

20704089138869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41803776, while the sum is 65.

The spelling of 20704089138869 in words is "twenty trillion, seven hundred four billion, eighty-nine million, one hundred thirty-eight thousand, eight hundred sixty-nine".